Sunday, May 08, 2016

Cooperations of composers (5)

We will see here the result of a cooperation of Ioannis Kalkavouras and Emmanuel Manolas, aiming to the composition of a helpmate in three and a half moves (that is, White plays first) with the following restrictions :
(a) The White has got only a Bishop and a Knight.
(b) The white pieces, B and S, will form with pericritical moves a battery which will fire with double check.
(c) The black in two variations makes different castling and is mated in the eighth row.
(d) No replacements of pieces (for twinning) is allowed.

Problem-815
Frank Fiedler
Gaudium, 2013
Source: WinChloe, no. 487666

r3k2r/8/8/4b3/8/4S1q1/8/1K1B4 (3 + 5)

h#3, 2 solutions

1.0-0 Sd5 2.Bh8 Bb3 3.Qg7 Sf6#
1.0-0-0 Sf5 2.Bb8 Bg4 3.Qc7 Sd6#

Here is shown the idea in simple form. The wB could be positioned on e2. The wK, to avoid checks by bR and bQ, could be only on columns b and e. But, with wKb5 the solutions are 1507, with wKe6 the solutions are 1283 and with wKe4 the solutions are 32. The wK is very well placed on b1! The white movements are not pericritical, they simply form the battery. If we force the restriction h#3,5, then many unwanted solutions appear, 68 in total.

In one variation the white battery is formed by the wB moving clockwise, and in the other by the wS moving anti-clockwise.The two mates appear symmetrical in the eighth row (vertical mirror, echo mates(0,4)).

Exercises of the day

Every day the website www.shredderchess.com offers to the readers of the blogs three easy chess exercises. They are given in three levels of difficulty, (L1, L2, and L3), and you may give the solution by moving the pieces with the mouse pointer. Below the diagram is then shown if the answer is correct or not.

If you miss OTB play...

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